The most retweeted tweet of the year? That was when Glee's Lea Michele admitted the death of her co-star and partner Cory Monteith, who died of a heroin and alcohol overdose in July. It was retweeted 408,266 times. President Obama's reelection victory tweet, however, still remains the most retweeted of all time.

Despite the fact that Twitter's music service has proven somewhat of a flop, the #Music hashtag was the top trend of 2013, while #nowplaying was at number 3. The number 2 slot? That went to #tcot—Top Conservatives on Twitter—that helps right-wingers find like-minded users.